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Numerical Analysis Information on the Web

Guide to Available Mathematical
Software
Netlib: a collection of mathematical software, papers, and databases
Math Forum Internet Mathematics Library
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Matlab Resources on the Web

Matlab Tutorial from MathWorks
Matlab Tutorial by Mark Gockenbach
Matlab introduction from the University of Utah
Matlab at MIT
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Octave

GNU Octave is a high-level language,
primarily intended for numerical computations. It is freely
redistributable software.
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FEniCS Project

FEniCS Project is
free software for automated solution of differential equations. Software tools
for working with computational meshes, finite element variational formulations
of PDEs, ODE solvers, and linear algebra are provided.
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freeFEM

freeFEM is an
implementation of a language dedicated to the finite element method. It
enables you to solve Partial Differential Equations easily.